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If your 8k Ultra sags down to 4800 volts you have something wrong. Possible weak AC line, or failed Oil caps. I used a Fluke HV probe and mine sits at 5900 volts. panel meter shows 6000. At rated 5kw

RG393 will do it easily, it is specified 25kW at 10MHz, 9.5kW at 50MHz. 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Building my first amplifier. Where to start? Look at

On Tue, Jan 9, 2024 at 11:15 PM, W7WRX wrote: > > Its not hurting the tube.? You need to remember that this is Single side > band with a duty cycle of 15 to 20 percent.? Even with heavy processor is

That fellow is well know for his total bs ratings. On that GU43B amp, he uses a pulsed 1.5 khz tone fed into the mic jack, with xcvr on SSB mode.? ?1 on, 4 off, pulsed at 30hz.? ( 20% duty cycle)?

Listen carefully. ONLY when the tube is driven full bore, the RMS? RF voltage is aprx .6? to .63? X loaded B+ voltage.? Then add 41% for the peak? RF voltage.? ?That peak RF voltage (only when

Got it. Thanks. My friend called MFJ. They told him they are LED's. I gotta feeling they may have been incandescents in the early years then changed to LED"s at one time? Just guessing. He ordered a

Its not hurting the tube. You need to remember that this is Single side band with a duty cycle of 15 to 20 percent. Even with heavy processor is not past 25%. What will the amp be used for??? This is

Yeah. His output power claims for all of his amps are out with the birds. Pure BS. 73, Alek VK6APK

Thanks for the link, im reading that as 3450v UNDER LOAD!? So unloaded he could be at near 4KV dc on a 3 KV rated tube.? Is "over volting" tubes this much typical?? Any rules of thumb to consider

The 12v rail is usually around 15 volts so the usually have dropping resistors just outside the meter where the bulb fits in. ?Measure the voltage before the dropping resistor and use a 12v bulb that

This guy runs his at 3450volts with 3kw out with 60 in. DC9DZ: Project Katana 3K – Power Amplifier (PA) using GU43b<http://www.dc9dz.de/en/katana3k.html> ________________________________ Sent:

Hi guys. I have pulled out my (big) plate transformer and made some measurements.? For voltage options I have 2100 Vac, 2445Vac and 2550Vac measured with 240v ac supply (today over lunch..) as

Does anyone verify the meter lamp voltage? I've spent a lot of time on google with no information on the voltage or replacement lamp part numbers. It looks like what Lou said it may be 12 volts but I

Lou, I see 12 volts supply to the meter board but even that diagram I have does not show the lamps. Bob [email protected]> wrote:

Lou, 12 volts? Thanks Bob W4JFA [email protected]> wrote:

Bob, the meter lamps are on the top of each meter. ?It’s a plastic removable plate (small) that lifts out with the bulb. ?The bulb runs off the control circuitry voltage. ?Lou Sent from the all

Hi all, Just an update, we got the fan job done in my friends AL-80B amp. All is well. I never noticed that the neither of the meter lights work. The amp is already put in it's place so it is a small

Apparently a? 1/2 wave resonator was tried....and works.? 1:1 input swr. Pegs a 5 kw slug.? 55% eff.? ?A 10 kw slug has been ordered. 2nd harmonic down 80 db.? 3rd harmonic down 38db.? This is

Wow, just checked-out their website... what a great resource! Thanks for sharing that Jim. -- 73, ~Alan

Metering, Power Supply, control circuitry, everything from the utility input to the HV of your choice. 230vac Single phase HV transformer rated at 1 amp continuous at 3000/3500/4000/4500 secondary